domain vs province

domain and province both are nouns.

Word	Noun	Adjective	Verb	Adverb
domain	Yes	No	No	No
province	Yes	No	No	No

As nouns, province is a hyponym of domain; that is, province is a word with a more specific, narrower meaning than domain:

domain (noun)	province (noun)
the content of a particular field of knowledge	the territory occupied by one of the constituent administrative districts of a nation
people in general; especially a distinctive group of people with some shared interest	the proper sphere or extent of your activities
(mathematics) the set of values of the independent variable for which a function is defined
territory over which rule or control is exercised
a particular environment or walk of life